diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
index 0ff7535..a6beb7e 100644
--- a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -73,6 +73,10 @@
     roomId: domain.room.Room["roomId"],
     hurricanes: UpdateHurricanesPayload,
   ): void;
+  publishInitialHurricanesToRoom(
+    roomId: domain.room.Room["roomId"],
+    hurricanes: UpdateHurricanesPayload,
+  ): void;
   publishGameEndToRoom(roomId: domain.room.Room["roomId"]): void;
   publishGameResultToRoom(
     roomId: domain.room.Room["roomId"],
@@ -125,6 +129,7 @@
   GameOutputPort,
   | "publishUpdatePlayersToRoom"
   | "publishMapCellUpdatesToRoom"
+  | "publishInitialHurricanesToRoom"
   | "publishUpdateHurricanesToRoom"
   | "publishGameEndToRoom"
   | "publishGameResultToRoom"
diff --git a/apps/server/src/domains/game/application/useCases/startGameUseCase.ts b/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
index 5301633..0ca5c95 100644
--- a/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
@@ -50,6 +50,13 @@
     output.publishMapCellUpdatesToRoom(roomId, tickData.cellUpdates);
   }
 
+  if (tickData.hurricaneInitialSnapshot.length > 0) {
+    output.publishInitialHurricanesToRoom(
+      roomId,
+      tickData.hurricaneInitialSnapshot,
+    );
+  }
+
   if (tickData.hurricaneUpdates.length > 0) {
     output.publishUpdateHurricanesToRoom(roomId, tickData.hurricaneUpdates);
   }
diff --git a/apps/server/src/domains/game/loop/GameLoop.ts b/apps/server/src/domains/game/loop/GameLoop.ts
index 3a8ae13..fb1755a 100644
--- a/apps/server/src/domains/game/loop/GameLoop.ts
+++ b/apps/server/src/domains/game/loop/GameLoop.ts
@@ -263,10 +263,13 @@
     const activePlayerIds = new Set<string>();
     const playerUpdates = this.collectChangedPlayerUpdates(activePlayerIds);
     this.cleanupInactivePlayerSnapshots(activePlayerIds);
+    const hurricaneInitialSnapshot =
+      this.hurricaneSystem.consumeInitialSyncPayload();
 
     return {
       playerUpdates,
       cellUpdates: this.mapStore.getAndClearUpdates(),
+      hurricaneInitialSnapshot,
       hurricaneUpdates: this.hurricaneSystem.getUpdatePayload(),
     };
   }
diff --git a/apps/server/src/domains/game/loop/HurricaneSystem.ts b/apps/server/src/domains/game/loop/HurricaneSystem.ts
index 7c49b1a..9208e1d 100644
--- a/apps/server/src/domains/game/loop/HurricaneSystem.ts
+++ b/apps/server/src/domains/game/loop/HurricaneSystem.ts
@@ -75,6 +75,7 @@
 export class HurricaneSystem {
   private readonly mapSize: MapGridSize;
   private hasSpawned = false;
+  private hasInitialSyncPending = false;
   private hurricanes: HurricaneState[] = [];
   private readonly lastHitAtMsByPlayerId = new Map<string, number>();
   private readonly lastSentSnapshotByHurricaneId = new Map<
@@ -99,12 +100,35 @@
     }
 
     this.hasSpawned = true;
+    this.hasInitialSyncPending = true;
     this.hurricanes = Array.from(
       { length: config.GAME_CONFIG.HURRICANE_COUNT },
       (_, index) => this.createHurricane(index),
     );
   }
 
+  /** 出現直後に1回だけ配信用の初期同期スナップショットを返す */
+  public consumeInitialSyncPayload(): HurricaneStatePayload[] {
+    if (!this.hasInitialSyncPending) {
+      return [];
+    }
+
+    this.hasInitialSyncPending = false;
+
+    return this.hurricanes.map((hurricane) => {
+      const snapshot = toHurricaneSyncSnapshot(hurricane);
+      this.lastSentSnapshotByHurricaneId.set(hurricane.id, snapshot);
+
+      return {
+        id: hurricane.id,
+        x: snapshot.x,
+        y: snapshot.y,
+        radius: snapshot.radius,
+        rotationRad: snapshot.rotationRad,
+      };
+    });
+  }
+
   /** ハリケーンを直線移動させ，境界で反射させる */
   public update(deltaSec: number): void {
     if (this.hurricanes.length === 0) {
@@ -212,6 +236,7 @@
   /** 状態を初期化する */
   public clear(): void {
     this.hasSpawned = false;
+    this.hasInitialSyncPending = false;
     this.hurricanes = [];
     this.lastHitAtMsByPlayerId.clear();
     this.lastSentSnapshotByHurricaneId.clear();
diff --git a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
index c1a3d03..18d0370 100644
--- a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
+++ b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
@@ -94,7 +94,17 @@
       roomId: RoomId,
       hurricanes: UpdateHurricanesPayload,
     ) => {
-      realtime.emitToRoom(
+      reliable.emitToRoom(
+        roomId,
+        protocol.SocketEvents.UPDATE_HURRICANES,
+        hurricanes,
+      );
+    },
+    publishInitialHurricanesToRoom: (
+      roomId: RoomId,
+      hurricanes: UpdateHurricanesPayload,
+    ) => {
+      reliable.emitToRoom(
         roomId,
         protocol.SocketEvents.UPDATE_HURRICANES,
         hurricanes,
diff --git a/packages/shared/src/domains/game/tick/tick.type.ts b/packages/shared/src/domains/game/tick/tick.type.ts
index c1ab933..d19a27c 100644
--- a/packages/shared/src/domains/game/tick/tick.type.ts
+++ b/packages/shared/src/domains/game/tick/tick.type.ts
@@ -13,5 +13,7 @@
 export interface TickData {
   playerUpdates: PlayerPositionUpdate[];
   cellUpdates: CellUpdate[];
+  /** 出現直後に1回だけ配信するハリケーン初期同期スナップショット */
+  hurricaneInitialSnapshot: HurricaneStatePayload[];
   hurricaneUpdates: HurricaneStatePayload[];
 }